Centrifuge modeling of one-dimensional subsurface contamination

One-dimensional contaminant transport through a saturated soil is modeled using a 1.2-m radius geotechnical centrifuge. Small-scale physical modeling in the centrifuge is achieved in relatively short time, at stress distributions that are similar to those experienced in the prototype (actual site)....

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Bibliographic Details
Published in:Journal of the American Water Resources Association 1998-12, Vol.34 (6), p.1415-1425
Main Authors: Nakajima, H. (University of California, Davis, CA.), Hirooka, A, Takemura, J, Marino, M.A
Format: Article
Language:English
Subjects:
CARACTERISTICAS MORFOLOGICAS SUELO
centrifuge modeling
contaminant transport
CONTAMINANTES
CONTAMINANTS
EQUATIONS
EQUIPO
ground water hydrology
MATEMATICAS
MATERIEL
MATHEMATICAL MODELS
MATHEMATICS
MATHEMATIQUE
MODELE
MODELE MATHEMATIQUE
MODELOS
MODELOS MATEMATICOS
POLLUANT
POLLUTANTS
POLLUTION DU SOL
POLUCION DEL SUELO
SATURATED CONDITIONS
SATURATED SOILS
SIMULACION
SIMULATION
SOIL MORPHOLOGICAL FEATURES
SOIL POLLUTION
subsurface contamination
SUBSURFACE LAYERS
TRAIT MORPHOLOGIQUE DU SOL
TRANSPORT PROCESSES
water quality
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Description
Summary:One-dimensional contaminant transport through a saturated soil is modeled using a 1.2-m radius geotechnical centrifuge. Small-scale physical modeling in the centrifuge is achieved in relatively short time, at stress distributions that are similar to those experienced in the prototype (actual site). A 0.05 mol/l of sodium chloride solution is used as a contaminant and conductivity cells measure the concentration of the contaminant throughout the porous medium. Scaling analysis for centrifuge modeling and 1-g modeling are briefly discussed and it is concluded that centrifuge modeling simulates the effect of molecular diffusion; however, scaling of the effect of mechanical dispersion may be violated in the centrifuge if the interstitial fluid velocity is high. Centrifuge test results show good agreement with the predicted relationship between the coefficient of hydrodynamic dispersion and the Peclet number using column tests. Centrifuge modeling can be used as a complement of numerical modeling although the effect of mechanical dispersion may be overestimated in the former
ISSN:1093-474X
1752-1688
DOI:10.1111/j.1752-1688.1998.tb05441.x